Holly Thornton, Homeowner IPM Specialist
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1 MARCH 2008 HOMEOWNER PLANT DISEASE CLINIC REPORT Holly Thornton, Homeowner IPM Specialist When I think of March, I picture delicious Morels poking up through the crowded leaf litter on the forest floor, and I wait impatiently until the end of the month when I can desperately search for these edible fungi. As you may know, I love mushroom hunting, especially when I know there are appetizing fungi just waiting to be eaten. Late March, early April is also the time of year when most Master Gardener classes, Green updates, and other statewide travels near an end, allowing me to actually spend some quality time in the diagnostic clinic. It is evident from the table below that homeowner sample submission has been relatively slow this winter but I suspect this will change as April approaches and it warms up. Soon, homeowner turf samples will flood the diagnostic lab in Athens. Turfgrass is the largest group of homeowner samples we receive in Athens. The majority of which are warm season grasses (Zoysia, St. Augustine, and Centipede). I expect the numbers for turf to be greater this year due to the extreme drought last year throughout much of the state (stressed turf = more disease). In this report I will review the diagnostic features of the two major disease problems that we see on homeowner warm-season turf grasses Large Patch and Take-all root rot. Large patch and Take-all root rot can easily be mistaken for one another. The macroscopic symptoms on turf often times look similar for the two pathogen infections. I have created the simplified key below to distinguish between the two and give you a starting point for diagnosing the problem in your office and/or during site visits. 1
2 SIMPLIFIED KEY to differentiate between TAKE-ALL ROOT ROT & LARGE PATCH 1. Distinct yellow/straw-colored/brown patches (regular or irregular in shape) are seen in the landscape 2 2. No lesions seen on leaf blades Roots a. Healthy (or moderately so), in tact roots & root hairs. b. Dark, rotted, blackened roots or none at all. 4. Water-soaked, reddish or dark lesions observed on leaf sheaths and/or crown of the plant 6 5. In the dissecting scope, black, runner hyphae seen on stolons of the grass and also along the roots In the compound scope, robust, brown (pigmented) mycelia with septations (cross walls) and right angle branches seen on/in the plant tissue...rhizoctonia solani (Large patch) 7. In the compound scope, loped hyphopodia (resembling puzzle pieces) are seen surrounding the brown, thin mycelia... Gaeummanomyces graminis var. graminis (Take-all root rot) 4 5 Take-all infection on St. Augustine grass A. Martinez 2
3 3 No roots and/or blackened rotted rots Take all infection on St. Augustine
4 DISSECTING MICROSCOPE black, runner hyphae and hyphopodia (resembles specks of pepper) COMPOUND MICROSCOPE black, runner hyphae and hyphopodia (resemble puzzle pieces) 4
5 Large Patch infection on St. Augustine grass A. Martinez DISSECTING SCOPE sheath infection with reddish/brown lesions A. Martinez 5
6 COMPOUND MICROSCOPE brown, septate mycelia with right anglebranches (mycelia is pinched at the branch) Large patch may be more difficult to diagnose because the mycelia of the fungus is hard to find and/or easily mistaken with other saprophytic fungal mycelia. You may give up and send the sample to the clinic before ever finding the large patch mycelia. Both diseases are active in the spring and fall when soil temperatures are ~60-65 F. Homeowners usually see symptoms of Take-all throughout the summer and this is due to the fact that summers in Georgia are very stressful and as you may recall, this is a stress-related pathogen. Take-all root rot is a disease related to improper soil ph, heavy thatch, poor drainage, improper mowing, etc. Both diseases often cause foliar tip dieback because of the crown and/or root infection that is occurring. Therefore, this symptom alone is not useful for distinguishing among the two diseases. Also, remember these pathogens are problems in the landscape because of one or more different cultural issues and applying pesticides will not exclusively correct the problem. For more information about management practices, please see one of the following references: o o o GA Pest Management Handbook Homeowner or Commercial edition o Vargas Jr., J.M Management of Turfgrass Diseases. o Turgeon, A.J Turfgrass Management. 7 th edition. o Christians, N Fundamentals of Turfgrass Management. 2 nd edition. 6
7 MARCH 2008 Homeowner Samples County Plant Common Name of Disease (Pathogen) Type of Sample DDDI or Physical Camden Red Cedar Unable to determine DDDI Camden Carolina No disease possible cultural Both Sapphire stress Camden Podocarpus No disease possible cultural Physical stresses fertility Catoosa Aucuba Leaf spot possible powdery DDDI mildew Clarke Lemon No disease Physical Elbert Zoysia No disease cultural thatch & Both compaction Fayette Browns Yew No disease possible site Physical problem saturated soils Gilmer Fig Possible Anthracnose DDDI Pierce St. Augustine Take all root rot Physical sod (Gaeumannomyces graminis var. graminis) Thomas Indian Entomosporium leaf spot DDDI Hawthorne (Entomosporium sp.) Toombs Camellia Possible cold damage DDDI Ware Camellia Unable to determine blurry images DDDI Total samples (late-february to late-march) = 12 7
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